artemv/test-lib

import gulp  from 'gulp';
import loadPlugins from 'gulp-load-plugins';
import del  from 'del';
import glob  from 'glob';
import path  from 'path';
import {Instrumenter} from 'isparta';
import webpack from 'webpack';
import webpackStream from 'webpack-stream';
import source  from 'vinyl-source-stream';

import mochaGlobals from './test/setup/.globals';
import manifest  from './package.json';

// Load all of our Gulp plugins
const $ = loadPlugins();

// Gather the library data from `package.json`
const config = manifest.babelBoilerplateOptions;
const mainFile = manifest.main;
const destinationFolder = path.dirname(mainFile);
const exportFileName = path.basename(mainFile, path.extname(mainFile));

function cleanDist(done) {
  del([destinationFolder]).then(() => done());
}

function cleanTmp(done) {
  del(['tmp']).then(() => done());
}

function onError() {
  $.util.beep();
}

// Lint a set of files
function lint(files) {
  return gulp.src(files)
      .pipe($.plumber())
      .pipe($.eslint())
      .pipe($.eslint.format())
      .pipe($.eslint.failOnError())
      .pipe($.jscs())
      .pipe($.jscs.reporter())
      .pipe($.jscs.reporter('fail'))
      .on('error', onError);
}

function lintSrc() {
  return lint('src/**/*.js');
}

function lintTest() {
  return lint('test/**/*.js');
}

function lintGulpfile() {
  return lint('gulpfile.babel.js');
}

function build() {
  return gulp.src(path.join('src', config.entryFileName + '.js'))
      .pipe($.plumber())
      .pipe(webpackStream({
        output: {
          filename: exportFileName + '.js',
          libraryTarget: 'umd',
          library: config.mainVarName
        },
        module: {
          loaders: [
            { test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader' }
          ]
        },
        devtool: 'source-map'
      }))
      .pipe(gulp.dest(destinationFolder))
      .pipe($.filter(['*', '!**/*.js.map']))
      .pipe($.rename(exportFileName + '.min.js'))
      .pipe($.sourcemaps.init({ loadMaps: true }))
      .pipe($.uglify())
      .pipe($.sourcemaps.write('./'))
      .pipe(gulp.dest(destinationFolder));
}

function _mocha() {
  return gulp.src(['test/setup/node.js', 'test/unit/**/*.js'], {read: false})
      .pipe($.mocha({
        reporter: 'dot',
        globals: Object.keys(mochaGlobals.globals),
        ignoreLeaks: false
      }));
}

function _registerBabel() {
  require('babel-register');
}

function test() {
  _registerBabel();
  return _mocha();
}

function coverage(done) {
  _registerBabel();
  gulp.src(['src/**/*.js'])
      .pipe($.istanbul({ instrumenter: Instrumenter }))
      .pipe($.istanbul.hookRequire())
      .on('finish', () => {
        return test()
            .pipe($.istanbul.writeReports())
            .on('end', done);
      });
}

const watchFiles = ['src/**/*', 'test/**/*', 'package.json', '**/.eslintrc', '.jscsrc'];

// Run the headless unit tests as you make changes.
function watch() {
  gulp.watch(watchFiles, ['test']);
}

function testBrowser() {
  // Our testing bundle is made up of our unit tests, which
  // should individually load up pieces of our application.
  // We also include the browser setup file.
  const testFiles = glob.sync('./test/unit/**/*.js');
  const allFiles = ['./test/setup/browser.js'].concat(testFiles);

  // Lets us differentiate between the first build and subsequent builds
  var firstBuild = true;

  // This empty stream might seem like a hack, but we need to specify all of our files through
  // the `entry` option of webpack. Otherwise, it ignores whatever file(s) are placed in here.
  return gulp.src('')
      .pipe($.plumber())
      .pipe(webpackStream({
        watch: true,
        entry: allFiles,
        output: {
          filename: '__spec-build.js'
        },
        module: {
          loaders: [
            // This is what allows us to author in future JavaScript
            { test: /\.js$/, exclude: /node_modules/, loader: 'babel-loader' },
            // This allows the test setup scripts to load `package.json`
            { test: /\.json$/, exclude: /node_modules/, loader: 'json-loader' }
          ]
        },
        plugins: [
          // By default, webpack does `n=>n` compilation with entry files. This concatenates
          // them into a single chunk.
          new webpack.optimize.LimitChunkCountPlugin({ maxChunks: 1 })
        ],
        devtool: 'inline-source-map'
      }, null, function() {
        if (firstBuild) {
          $.livereload.listen({port: 35729, host: 'localhost', start: true});
          var watcher = gulp.watch(watchFiles, ['lint']);
        } else {
          $.livereload.reload('./tmp/__spec-build.js');
        }
        firstBuild = false;
      }))
      .pipe(gulp.dest('./tmp'));
}

// Remove the built files
gulp.task('clean', cleanDist);

// Remove our temporary files
gulp.task('clean-tmp', cleanTmp);

// Lint our source code
gulp.task('lint-src', lintSrc);

// Lint our test code
gulp.task('lint-test', lintTest);

// Lint this file
gulp.task('lint-gulpfile', lintGulpfile);

// Lint everything
gulp.task('lint', ['lint-src', 'lint-test', 'lint-gulpfile']);

// Build two versions of the library
gulp.task('build', ['lint', 'clean'], build);

// Lint and run our tests
gulp.task('test', ['lint'], test);

// Set up coverage and run tests
gulp.task('coverage', ['lint'], coverage);

// Set up a livereload environment for our spec runner `test/runner.html`
gulp.task('test-browser', ['lint', 'clean-tmp'], testBrowser);

// Run the headless unit tests as you make changes.
gulp.task('watch', watch);

// An alias of test
gulp.task('default', ['test']);